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(No Model.)

C. COLEMAN. ALARM SYSTEM.

Nog-606,405. Patented June 28, 1898..

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OLYDE COLEMAN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- MENTS, OF TVVO-TI'IIRDS TO GEORGE P. JONES, OF SAME PLACE.

ALARM SYSTEM.

SPECIFICATION forming parser Letters Patent No. 606,405, dammen@ es, 189s. Application iiled September 3, 1897. Serial No. 650,475. (No'model.)

To all whom t nfty concern: j

Be it known that I, OLYDE COLEMAN, a citi- Zen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Im# provement in JAlarm Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to an alarm system more particularly adapted for the protection "of vaults, safes, and similar inclosures.

My object is to provide a simple and cheap system whereby anytampering with the vault or inclosure will operate a signal device at the alarmstation, and this without the employment of wires extending between the protected structure and the alarm-station.

In alarm systems as heretofore constructed it has been necessary to provide electrical conductors or other parts extending between the structure to be protected and the alarmstation, andthese exposed parts have been the source of considerable trouble, necessitating the employment of more or less complicated cables and mechanism to prevent the defeating of the alarm by tampering with the exposed parts. In accordance with the present invention the connecting-conductors are entirely done away with and a device is provided in the protected structure which is thrown into operation by any tampering with the protecting-barrier to produce a series of vibrations capable of transmission through the intervening medium to actuate a signal device at the alarm-station. For this purpose the well-known Hertzian waves or vibrations may be employed and a IIertzianwave transmitter placed within the protected structure and arranged to be thrown into operation by any tampering with the vault, while at the alarm-station a receiver responding to the waves may be placed.

I have illustrated my invention in the accompanying drawing in connection with the so called Marconi transmitter and receiver; but other forms may be employed.-

The transmitter comprises a pair of balls a b, separated by a body of oil c, inclosed within a box c',- and in close proximity to these balls are the smaller balls a.' h', connected to the opposite sides of theV secondary d of aninductioircoil or transformer in parallel with a condenser c2, the primary d of the transformer being connected in circuit with the battery or other so urce of electricity e, connected in a local circuit with a circuitcloser, which in the present instance is illustrated as a pointer or finger f, adapted to vibrate between the contacts f f2 and carried on a pivoted armature-lever f3, normally counterbalanced by the opposing actions of the spring 4 and magnet f5. The magnet is included in circuit with the batteryg and the conductors h 7L of an electric protective circuit, which is arranged to prevent access to the interior ofthe vault without disturbing the circuit, the circuit being shown in the drawing in diagram. The protective circuit may be of any preferred construction. In circuit with the conductors h h' of the speeic construction illustrated is aresistance h2, which maintains the current through the magnet f5 at a proper strength to counterbalance the spring f4.

If the conductors h h be crossed or cut, the current will in, the first instance increase and in the second decrease to cause the iinger to engage the contact f' or the contact 2, and thereby close the circuit of the battery e through the induction-coil or transformer, to thereby cause a discharge between the discharge-balls a b, setting up a source of electrical waves, which are transmitted to the receiver at the alarm-station to aetuate the signal.

The receiver comprises a tube 7.a, within which are a pair of terminals 7c 7a2, separated by a mass of loose material comprising nickel and silver particles, with a slight trace of mercury, the particles being normally in a loose condition, whereby they offer a very high resistance to the passage of the current of battery Z, which is connected with the opposite terminals le la?. "Wings m m are connected with the terminals 7s 7a2 and are o f proper size to intercept the waves produced by the transmitter and pass the same through 'the terminals to cause the particles between the terminals to cohere, and thereby reduce the resistance of the circuit of battery l to permit the loo i claim as new, and

current to traverse and actuate the magnet Z, to thereby close the circuit of battery o through signal device p, and thereby sound the alarm, which continues so long as the magnet Z remains energized and until the mass of particles between the terminals has been agitated by striking or shakin g the tube s to cause the terminals to decohere, thereby increasing the resistance therethrough to practically check the flow of the current through the magnet Z.

Any attempt to enter the vault will thus throw the transmitter intc operation and produce a series of waves, which actuate the receiver at the alarm-station and close the local alarm-circuit thereat, causing the bell or other signal device to give a prolonged signal, which is continued until the watchman or attendant stops the sounding of the alarm by decohering the particles between the electrodes.

rlhe alarm device may be inclosed within a housing which is protected against entry by the alarm system to prevent access to the alarm without sounding the alarm. The protective circuit for this purpose preferably comprises a pair of normally-separated conductors r r', arranged to be closed together by an attempt to force an entry of the housing, the conductors being connected with the battery-circuit of the receiver upon opposite sides of the electrodes 71; k2. The closing of the conductors rr' together will close the circuit of battery Z to sound the alarm.

By the term Hertzian waves, as employed herein, I contemplate any electrical waves produced by electrostatic discharges or otherwise capable of transmission lto a distance through the intervening media.

Having described my invention, what I desire to secure by Letters Patent, is

l. The combination with a vault or other inclosure to be protected, of a wave-transmitter thereat capable of transmitting Vibrations to a distance through the intervening media,

an alarm system for throwing said transmitter into action by an attempt to enter the vault, and a receiver'at the alarm-station responsive to the waves produced bythe transmitter for actuating a signal device to give an alarm, substantially as described.

2. The combination with a vault or other inclosure to be protected, of a Ilertzian-wave transmitter thereat, an alarm system for actuating said transmitter by an attempt to enter the vault, a Hertzian-wave receiver at the alarm-station and a signal device actuated by said receiver7 substantially as described.

3. The combination with a vault or other inclosure to be protected, of a llertzian-wave transmitter thereat, an electrical barrier protecting said vault against entrance and arranged to actuate said transmitter when disturbed, a I-Iertzian-wave receiver at the alarmstation, and a signal device adapted to be actuated by said receiver, substantially as described.

4.' The combination with a vault or other inclosure to be protected, of a Hertzian-wave transmitter thereat, an alarm system for throwing said transmitter into action by an attempt to enter the vault, a receiver at the alarm-station comprising a mass of particles adapted to be cohered by the Hertzian waves, and a signal device arranged to be thrown into operation by said receiver, substantially as described.

5. The combination with a vault or other inclosure to be protected, of a Hertzian-wave transmitter thereat, an alarm system for throwing said transmitter into action by an attempt to enter the vault, a receiver at the alarm-station comprising a mass of particles adapted to be cohered by the I-Iertzian waves, and a signal device arranged to be operated continuously by said receiver until the cohering particles have been decohered, substan` tially as described.

G. The combination with a vault or other inclosure to be protected, of a Ilertzian-wave transmitter thereat, an alarm system for throwing said transmitter into action by an attempt to enter the vault, a receiver at the alarm-station, a signal device actuated thereby and an alarm system protecting the alarm device against access and arranged to actuate a signal device when interfered with, substantially as described.

7. The combination with a vault or other inclosure to be protected, of a Ilertzian-wave transmitter thereat, an alarm system for throwing said transmitter into action by an attempt to enter the vault, a receiver at the alarm-station comprising a mass of particles adapted to be cohered by the Hertzian waves, a signal device arranged to be operated by said receiver and a normally open protective circuit guarding the alarm device against access thereto and arranged in multiple with said coherer, substantially as described.

In witness whereof I have hereunto subscribed my name in the presence of two witnesses.

CLYDE COLEMAN. Vitnesses:

W. CLYDE J oNns, M. R. RocHFoRD.

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